author | twisti |
Wed, 11 Aug 2010 05:51:21 -0700 | |
changeset 6187 | 4fa7845f7c14 |
parent 5547 | f4b087cbb361 |
child 7397 | 5b173b4ca846 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1998, 2006, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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class ciMethod; |
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class MethodLivenessResult : public BitMap { |
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private: |
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bool _is_valid; |
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public: |
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MethodLivenessResult(BitMap::bm_word_t* map, idx_t size_in_bits) |
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: BitMap(map, size_in_bits) |
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, _is_valid(false) |
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{} |
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MethodLivenessResult(idx_t size_in_bits) |
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: BitMap(size_in_bits) |
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, _is_valid(false) |
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{} |
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void set_is_valid() { _is_valid = true; } |
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bool is_valid() { return _is_valid; } |
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}; |
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class MethodLiveness : public ResourceObj { |
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public: |
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// The BasicBlock class is used to represent a basic block in the |
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// liveness analysis. |
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class BasicBlock : public ResourceObj { |
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private: |
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// This class is only used by the MethodLiveness class. |
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friend class MethodLiveness; |
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// The analyzer which created this basic block. |
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MethodLiveness* _analyzer; |
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// The range of this basic block is [start_bci,limit_bci) |
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int _start_bci; |
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int _limit_bci; |
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// The liveness at the start of the block; |
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BitMap _entry; |
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// The summarized liveness effects of our direct successors reached |
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// by normal control flow |
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BitMap _normal_exit; |
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// The summarized liveness effects of our direct successors reached |
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// by exceptional control flow |
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BitMap _exception_exit; |
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// These members hold the results of the last call to |
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// compute_gen_kill_range(). _gen is the set of locals |
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// used before they are defined in the range. _kill is the |
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// set of locals defined before they are used. |
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BitMap _gen; |
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BitMap _kill; |
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int _last_bci; |
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// A list of all blocks which could come directly before this one |
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// in normal (non-exceptional) control flow. We propagate liveness |
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// information to these blocks. |
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GrowableArray<BasicBlock*>* _normal_predecessors; |
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// A list of all blocks which could come directly before this one |
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// in exceptional control flow. |
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GrowableArray<BasicBlock*>* _exception_predecessors; |
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// The following fields are used to manage a work list used in the |
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// dataflow. |
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BasicBlock *_next; |
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bool _on_work_list; |
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// Our successors call this method to merge liveness information into |
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// our _normal_exit member. |
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bool merge_normal(BitMap other); |
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// Our successors call this method to merge liveness information into |
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// our _exception_exit member. |
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bool merge_exception(BitMap other); |
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// This helper routine is used to help compute the gen/kill pair for |
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// the block. It is also used to answer queries. |
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void compute_gen_kill_range(ciBytecodeStream *bytes); |
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// Compute the gen/kill effect of a single instruction. |
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void compute_gen_kill_single(ciBytecodeStream *instruction); |
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// Helpers for compute_gen_kill_single. |
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void load_one(int local); |
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void load_two(int local); |
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void store_one(int local); |
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void store_two(int local); |
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BasicBlock(MethodLiveness *analyzer, int start, int limit); |
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// -- Accessors |
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int start_bci() const { return _start_bci; } |
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int limit_bci() const { return _limit_bci; } |
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void set_limit_bci(int limit) { _limit_bci = limit; } |
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BasicBlock *next() const { return _next; } |
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void set_next(BasicBlock *next) { _next = next; } |
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bool on_work_list() const { return _on_work_list; } |
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void set_on_work_list(bool val) { _on_work_list = val; } |
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// -- Flow graph construction. |
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// Add a basic block to our list of normal predecessors. |
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void add_normal_predecessor(BasicBlock *pred) { |
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_normal_predecessors->append_if_missing(pred); |
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} |
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// Add a basic block to our list of exceptional predecessors |
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void add_exception_predecessor(BasicBlock *pred) { |
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_exception_predecessors->append_if_missing(pred); |
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} |
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// Split the basic block at splitBci. This basic block |
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// becomes the second half. The first half is newly created. |
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BasicBlock *split(int splitBci); |
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// -- Dataflow. |
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void compute_gen_kill(ciMethod* method); |
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// Propagate changes from this basic block |
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void propagate(MethodLiveness *ml); |
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// -- Query. |
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MethodLivenessResult get_liveness_at(ciMethod* method, int bci); |
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// -- Debugging. |
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void print_on(outputStream *os) const PRODUCT_RETURN; |
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}; // End of MethodLiveness::BasicBlock |
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private: |
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// The method we are analyzing. |
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ciMethod* _method; |
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ciMethod* method() const { return _method; } |
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// The arena for storing structures... |
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Arena* _arena; |
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Arena* arena() const { return _arena; } |
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// We cache the length of the method. |
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int _code_size; |
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// The size of a BitMap. |
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int _bit_map_size_bits; |
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int _bit_map_size_words; |
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// A list of all BasicBlocks. |
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BasicBlock **_block_list; |
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// number of blocks |
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int _block_count; |
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// Keeps track of bci->block mapping. One entry for each bci. Only block starts are |
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// recorded. |
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GrowableArray<BasicBlock*>* _block_map; |
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// Our work list. |
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BasicBlock *_work_list; |
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#ifdef COMPILER1 |
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// bcis where blocks start are marked |
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BitMap _bci_block_start; |
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#endif // COMPILER1 |
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// -- Graph construction & Analysis |
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// Compute ranges and predecessors for basic blocks. |
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void init_basic_blocks(); |
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// Compute gen/kill information for all basic blocks. |
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void init_gen_kill(); |
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// Perform the dataflow. |
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void propagate_liveness(); |
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// The class MethodLiveness::BasicBlock needs special access to some |
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// of our members. |
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friend class MethodLiveness::BasicBlock; |
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// And accessors. |
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int bit_map_size_bits() const { return _bit_map_size_bits; } |
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int bit_map_size_words() const { return _bit_map_size_words; } |
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// Work list manipulation routines. Called internally by BasicBlock. |
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BasicBlock *work_list_get(); |
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void work_list_add(BasicBlock *block); |
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// -- Timing and Statistics. |
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// Timers |
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static elapsedTimer _time_build_graph; |
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static elapsedTimer _time_gen_kill; |
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static elapsedTimer _time_flow; |
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static elapsedTimer _time_query; |
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static elapsedTimer _time_total; |
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#ifndef PRODUCT |
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// Counts |
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static long _total_bytes; |
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static int _total_methods; |
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static long _total_blocks; |
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static int _max_method_blocks; |
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static long _total_edges; |
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static int _max_block_edges; |
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static long _total_exc_edges; |
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static int _max_block_exc_edges; |
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static long _total_method_locals; |
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static int _max_method_locals; |
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static long _total_locals_queried; |
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static long _total_live_locals_queried; |
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static long _total_visits; |
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#endif |
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public: |
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// Create a liveness analyzer for a method |
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MethodLiveness(Arena* arena, ciMethod* method); |
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// Compute liveness information for the method |
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void compute_liveness(); |
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// Find out which locals are live at a specific bci. |
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MethodLivenessResult get_liveness_at(int bci); |
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#ifdef COMPILER1 |
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const BitMap get_bci_block_start() const { return _bci_block_start; } |
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#endif // COMPILER1 |
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static void print_times() PRODUCT_RETURN; |
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}; |